[PRCo] Tunnel Carhouse & "maintenance"

[Pepa Kalousek]

Hi!
Does anybody know what was the single-track building added to the old South Hills barn No.1 during PAT era? I was a PRCo repairman in my previous life but suffered from serious sclerosis at high age and can't bethink oneself...
By the way, what was the PCC maintenance cycle in Pittsburgh? I mean mileages between both routine inspections and heavy maintenance, what jobs had been being done and where ec ec.

Boris